protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; g.PixelOffsetMode = PixelOffsetMode.Half; g.SmoothingMode = SmoothingMode.HighQuality; using (SolidBrush brush = new SolidBrush(PanelColor)) { g.DrawRoundedRectangle(brush, ClientRectangle.SizeOffset(1), Radius); } }